# US 2019/0245345 A1 · Electrostatic protection device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0245345 A1 - Document ID: US20190245345A1 - Status: Published application - Kind: A1 - Application number: 15/891,052 - Filed: 2018-02-07 - Published: 2019-08-08 - Earliest claimed: 2018-02-07 - Assignees: International Business Machines Corporation - Applicants: International Business Machines Corporation - Inventors: Pier Andrea Francese; Thomas Morf - Web page: https://patentgrep.com/patent/US20190245345A1 ## CPC - H02H 9/046: {responsive to excess voltage appearing at terminals of integrated circuits} - H03H 7/0107: {Non-linear filters} - H03H 7/09: Filters comprising mutual inductance - H10D 89/611: {using diodes as protective elements} - H10D 89/911: {using passive elements as protective elements} - H03H 7/38: Impedance-matching networks - H03H 2001/0078: {comprising spiral inductor on a substrate} - H03H 2001/0092: {Inductor filters, i.e. inductors whose parasitic capacitance is of relevance to consider it as filter} - H10D 1/20: Inductors - H10D 1/68: Capacitors having no potential barriers - H02H: EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS (indicating or signalling undesired working conditions G01R, e.g. G01R31/00, G08B; locating faults along lines G01R31/08; emergency protective devices H01H) - H03H: IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS (waveguides, resonators, lines or other devices of the waveguide type H01P) - H10D: INORGANIC ELECTRIC SEMICONDUCTOR DEVICES ## Abstract Aspects of the invention provide for an electrostatic protection device for protecting an input port of an electronic circuit. The electrostatic protection device includes a stacked coil assembly with four ports. The electrostatic protection device further includes a human body model ESD protection circuit, a charge device model ESD protection circuit, and an impedance matching circuit. The human body model ESD protection circuit, the charge device model ESD protection circuit, and the impedance matching circuit are connected to separate ports selected from the four ports. ## Claims ### Claim 1 An electrostatic protection device for protecting an input port of an electronic circuit, comprising: a stacked coil assembly with four ports; a human body model ESD protection circuit; a charge device model ESD protection circuit; and an impedance matching circuit; wherein the human body model ESD protection circuit, the charge device model ESD protection circuit, and the impedance matching circuit are connected to separate ports selected from the four ports. ### Claim 2 (depends on 1) The electrostatic protection device of claim 1, wherein the stacked coil assembly comprises a first coil, a second coil, and a third coil. ### Claim 3 (depends on 2) The electrostatic protection device of claim 2, wherein the first coil is at least partially overlapping with the second coil, and wherein the second coil is at least partially overlapping with the third coil. ### Claim 4 (depends on 3) The electrostatic protection device of claim 3, wherein: the first coil has a first axis, the second coil has a second axis, the third coil has a third axis, the first axis is offset from the second axis, the second axis is offset from the third axis, and the first axis is offset from the third axis. ### Claim 5 (depends on 2) The electrostatic protection device of claim 2, wherein the first coil is inductively coupled to the second coil, the second coil is inductively coupled to the third coil, and the first coil is inductively coupled to the third coil. ### Claim 6 (depends on 2) The electrostatic protection device of claim 2, wherein: the electrostatic protection device comprises a first port of the four ports connected to an external input port, the electrostatic protection device further comprises a second port of the four ports connected to the charge device model ESD protection circuit, the electrostatic protection device further comprises a third port connected to the human body model ESD protection circuit, the electrostatic protection device further comprises a fourth port of the four ports connected to the impedance matching circuit, and the electrostatic protection device further comprises an internal input port configured for connecting between the input port of the electronic circuit and the charge device model ESD protection circuit. ### Claim 7 (depends on 6) The electrostatic protection device of claim 6, wherein the first port is connected to a first input of the first coil, the second port is connected to a second input of the first coil and a first input of the second coil, the third port is connected to a second input of the second coil and a first input of the third coil, and the fourth port is connected to a second input of the third coil. ### Claim 8 (depends on 2) The electrostatic protection device of claim 2, wherein: the electrostatic protection device comprises a first port of the four ports connected to the charge device model ESD protection circuit, the electrostatic protection device further comprises a second port connected to an external input port configured for connecting to the input port of the electronic circuit, the electrostatic protection device further comprises a third port of the four ports connected to the human body model ESD protection circuit, the electrostatic protection device further comprises a fourth port of the four ports connected to the impedance matching circuit, and the electrostatic protection device further comprises an internal input port configured for connecting between the input port of the electronic circuit and the charge device model ESD protection circuit. ### Claim 9 (depends on 8) The electrostatic protection device of claim 8, wherein the first port is connected to a first input of the first coil, the second port is connected to a second input of the first coil and a first input of the second coil, the third port is connected to a second input of the second coil and a first input of the third coil, and the four port is connected to a second input of the third coil. ### Claim 10 (depends on 2) The electrostatic protection device of claim 2, wherein: the electrostatic protection device comprises a first port of the four ports connected to an external input port, the electrostatic protection device further comprises a second port of the four ports connected to the human body model ESD protection circuit, the electrostatic protection device further comprises a third port connected to the charge device model ESD protection circuit, the electrostatic protection device further comprises a fourth port of the four ports connected to the impedance matching circuit, and the electrostatic protection device further comprises an internal input port configured for connecting between the input port of the electronic circuit and the charge device model ESD protection circuit. ### Claim 11 (depends on 10) The electrostatic protection device of claim 10, wherein the first port is connected to a first input of the first coil, the second port is connected to a second input of the first coil and a first input of the second coil, the third port is connected to a second input of the second coil and a first input of the third coil, and the four port is connected to a second input of the third coil. ### Claim 12 (depends on 2) The electrostatic protection device of claim 2, wherein: the electrostatic protection device comprises a first port of the four ports connected to an external input port, the electrostatic protection device further comprises a second port connected to the human body model ESD protection circuit, the electrostatic protection device further comprises a third port connected to the impedance matching circuit, the electrostatic protection device further comprises a fourth port of the four ports connected to the charge device model ESD protection circuit, and the electrostatic protection device further comprises an internal input port configured for connecting between the input port of the electronic circuit and the human body model ESD protection circuit. ### Claim 13 (depends on 12) The electrostatic protection device of claim 12, wherein: the first port is connected to a first input of the first coil; the second port is connected to a second input of the first coil, a first input of the second coil, and a first input of the third coil; the third port is connected to a second input of the second coil; and the fourth port is connected to a second input of the third coil. ### Claim 14 An integrated circuit comprising: an electronic circuit having an input port; and an electrostatic protection device for protecting the input port of the electronic circuit, the electrostatic protection device in turn comprising: a stacked coil assembly with four ports; a human body model ESD protection circuit, a charge device model ESD protection circuit, and an impedance matching circuit; wherein the human body model ESD protection circuit, the charge device model ESD protection circuit, and the impedance matching circuit are connected to separate ports selected from the four ports. ### Claim 15 (depends on 14) The integrated circuit of claim 14, wherein the integrated circuit comprises at least one of: a microprocessor, a microcontroller, a graphical processing unit, a central processing unit, wide band amplifier, analog to digital converter, digital to analog converter, wireline transceiver circuit, and a telecommunications chip. ### Claim 16 (depends on 15) The integrated circuit of claim 15, wherein: the integrated circuit comprises a substrate; the electronic circuit is formed on the substrate; the electrostatic protection device is formed on the substrate; the stacked coil assembly comprises a first coil, a second coil, and a third coil; the first coil, the second coil, and the third coil are formed on separate layers on the substrate; the first coil is adjacent to the second coil; and the second coil is adjacent to the third coil. ### Claim 17 (depends on 16) The integrated circuit of claim 16, wherein: the first coil has a first axis, the second coil has a second axis, the third coil has a third axis, the first axis is offset from the second axis, the second axis is offset from the third axis, and the first axis is offset from the third axis. ### Claim 18 (depends on 16) The integrated circuit of claim 16, wherein the first coil is inductively coupled to the second coil, the second coil is inductively coupled to the third coil, and the first coil is inductively coupled to the third coil. ### Claim 19 (depends on 14) The integrated circuit of claim 14, wherein: the electrostatic protection device comprises a first port of the four ports connected to an external input port, the electrostatic protection device further comprises a second port of the four ports connected to the charge device model ESD protection circuit, the electrostatic protection device further comprises a third port connected to the human body model ESD protection circuit, the electrostatic protection device further comprises a fourth port of the four ports connected to the impedance matching circuit, and the electrostatic protection device further comprises an internal input port configured for connecting between the input port of the electronic circuit and the charge device model ESD protection circuit. ### Claim 20 (depends on 19) The integrated circuit of claim 19, wherein the first port is connected to a first input of the first coil, the second port is connected to a second input of the first coil and a first input of the second coil, the third port is connected to a second input of the second coil and a first input of the third coil, and the fourth port is connected to a second input of the third coil.